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Originally Posted by JeffTSX
Okay can you tell me then? Cause I've flipped through the service manaul and I can't seem to find the "wire" but I can only locate the "cluster unit". I've been trying to install a Stwert Warner shift light for a while now.
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The Tachometer wire is BLUE (AC) at ECM/PCM located on front of the transmission tunnel (close to the firewall). The connectors are on passenger side. The tach wire is in the white 31 pin connector E, pin 25.
I can vouch for that because I used that location myself. It's kind of hard to get to. I had to move the carpet away from the area, then dig to find that connector, disconnect it, find the wire and then solder into it (I tested it while it was connected, of course), then I could plug it back in. If you're going to use a wire connector instead of soldering, you may not need to unplug it.
I also have some info on the Speed sense wire, but this I never tested:
BLUE/WHITE (AC) at PCM module in front of center console under dash.
Good luck